In the moment I start the emulation, i see how the characters of SMBMelee move slowly when there are more than two players, if I turn off the sound in the Dolphin, it runs a little faster and the floor graphics change to black.

In the moment I start the emulation, i see how the characters of SMBMelee move slowly when there are more than two players, if I turn off the sound in the Dolphin, it runs a little faster and the floor graphics change to black.

The speed of emulation heavily depends on processor speed, but not much on others. I also have 2.0 ghz dual core, and I get same results as you do. At current point, we can't do anymore to speed up dolphin.